The invention discloses a power cable erecting device. The power cable erecting device comprises a pushing cart body, wherein the left side surface of the pushing cart body is fixedly provided with apushing handle; a hollow cavity is arranged in the pushing cart body, and a corner lifting device and a tamping machine mounted at the bottom of the corner lifting device are fixedly arranged in the hollow cavity; a first accommodating groove is arranged in the bottom surface of the tamping machine; a sliding tamping block is connected in the first accommodating groove in a sliding fit manner, theleft and right inner walls of the first accommodating groove are oppositely provided with guiding devices which are separately in fit connection with the left and right outer walls of the sliding tamping block, and a tamping driving device is arranged in the top wall in the first accommodating groove; and a sunk groove is arranged in the bottom surface of the sliding tamping block, a sliding groove is arranged in the sliding tamping block at the upper side of the sunk groove, and a channel groove is arranged in the sliding tamping block between the bottom of the sliding groove and the bottomwall of the sunk groove in a penetrating manner. The power cable erecting device is simple in structure and convenient to operate, and can realize the driving work of automatically controlling tampingoperation, reduce the labor capacity of workers, increase the working efficiency and improve the quality.